import React from 'react';
import Board from './Board';
import './game.css';



function calculateWinner(squares) {
    const lines = [
        [0, 1, 2],
        [3, 4, 5],
        [6, 7, 8],
        [0, 3, 6],
        [1, 4, 7],
        [2, 5, 8],
        [0, 4, 8],
        [2, 4, 6],
    ];
    for (let i = 0; i < lines.length; i++) {
        const [a, b, c] = lines[i];
        if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
            return squares[a];
        }
    }
    return null;
}




class Game extends React.Component {

    constructor(props) {
        super(props);
        this.state = {
            history: [{
                squares: Array(9).fill(null)
            }],
            xIsNext: true,
            stepNum: 0
        }
    }

    jumpTo = (step) => {
        this.setState({
            stepNum: step,
            xIsNext: (step % 2) ? false : true
        });
    }

    handleClick = (i) => {
        const history = this.state.history.slice(0, this.state.stepNum + 1);
        const current = history[history.length - 1];
        console.log(current)
        const squares = current.squares.slice();
        if (calculateWinner(squares) || squares[i]) {
            return;
        }
        squares[i] = this.state.xIsNext ? 'X' : 'O';
        this.setState({
            history: history.concat([{
                squares: squares
            }]),
            xIsNext: !this.state.xIsNext,
            stepNum: history.length
        });
    }

    render() {
        const history = this.state.history;
        const current = history[this.state.stepNum];
        const winner = calculateWinner(current.squares);

        const moves = history.map((step, move) => {
            const desc = move ? 'Move # ' + move : 'Game Start';
            return(
                <li key={move}>
                    <a href='javacript:void(0);' onClick={() => {this.jumpTo(move)}}>{ desc }</a>
                </li>
            );
        });



        let status;
        if (winner) {
            status = 'Winner: ' + winner;
        } else {
            status = 'Next player: ' + (this.state.xIsNext ? 'X' : 'O');
        }
        return (
            <div className="game">
                <div className="game-board">
                    <Board squares={current.squares} onClick={(i) => this.handleClick(i)} />
                </div>
                <div className="game-info">
                    <div>{ status }</div>
                    <ol>{ moves }</ol>
                </div>
            </div>
        );
    }
}

export default Game;